Pressure sensitive adhesive tape and core



I. KAPLAN April 27, 1954 PRESSURE SENSITIVE ADHESIVE: TAPE AND CORE Filed Jan. 21, 1950 INVENTOR Kaplan ATTORNEY Patented Apr. 27, 1954 OFFICE PRESSURE. SENSITIVE ADHESIVE TAPE" AND CORE IrvingKaplan, Flushing, N. Y. Application January 21, 1950, Serial No. 139,953

5v Claims. 1

This invention relates to adhesive tapes; more particularly to rolls of adhesive tapes and still more particularly to spools or cores therefor'and dispensing means for such tapes.

It is an object of my invention to provide for use in mounting pressure sensitive adhesive tape, such as masking'tape of non-scufiing or tear resisting backing carrying united thereto a layer of pressure sensitive adhesive tape or a backing such as regenerated cellulose having a coating of pressure sensitive adhesive of the type generally referred to as sealing tapes, means whereby economy is effected in the dispensing of strips of tape from'a roll, spool or core and to make more convenient the dispensing; of strips of tape from a roll.

For convenience of referenceI-will refer herein to pressure sensitive adhesive tape as any of the aforementioned tapes comprising masking tape, whether fiat back paper or" creped' paper integrated to resist lamination to a substantial degree, or formed with a backing coating which resists the tacky adhesion of the film or coating of pressure sensitive adhesive on the reverse side. These forms of pressure sensitive adhesive tape may include films of regenerated cellulose, cellulose acetate, nylon or other integrated or plasticized film forming material treated to form an integrated sheet on which there is carried united thereto a film of pressure sensitive ad- Illustrative of the typeof' pressure'sensitive adhesive contemplated by me are the ad'- hesive tapes made under the patents to Drew 1,760,820 and 2,177,627.

Pressure sensitive adhesive tapes as herein designated, when convolutedor rewound upon spools, cores of continuous cylindrical periphery actively adhere even though removable by stripping forces exerted as recognized: in this field; The adhesive contact may be so. energetic that normal manual means for" same from a roll is attended withunusual 'care,:or very frequently resultsin tearing-the strip; When wound upon a spool or. core made. offlaminated cardboard, the union is so intense that asubstantial length of tape is lost for'useor, if" embodied in a dispensing device, stripping of the last remnantsof tape is prevented, to make; rethread ing of' a. new batch difiicult, and to result in a wasting of even more than a length which sticks to the core. 7

While I have found that by edging the tape with a linerv formed. as. a. folded edge, of the tape located. at. suclred'ges, the. handling of. the. up,"

rolling, of the tape. is simplified; the pressure} of stripping the winding on a-roll with such liner directs the pressure sensitive adhesive coating into pressure contact with the underlying surface, even though the liner, whether as a separate element or as an edging, minimizes the exposed area of pressure sensitive adhesive. I have found that by the provision of a spool or core upon which the pressure sensitive adhesive tape is wound which localizes'the pressure contact to a relatively small area of the transverse section of the tape, that normal rewinding tension may be applied to leave a substantial section, bringing an adhesive and back surface contiguous without energetic contact, thereby to reduce the force necessary t'o'strip the tape from'the roll and to make available every section of the tape for removal from the core or spool.

I'have found that by the provision of a windup spool orroll having transverse areas which relieve the contacting pressure of winding a convolution or roll of tape is produced which strips readily by manual means and minimizes tearing. I havefound' that rolls or spools having acut-away belt to localize the pressure contact of winding and leave along the length of the tape other areas which are not convoluted under-wind-up pressure that stripping manually'is made possible. Furthermore, I have found that by the provision of a core having a belt portion cut away from the cylindrical surface thereof that during winding the convolutions are arranged to provide localized contacting portions, with rapidly removable segmentsalong the length of the tape, which facilitates rapid stripping.

, Still more particularly I have found. that by the provision of a-core or spool having only edgewise contact'and' a clearance belt portion which relieves the tension of winding; pressure sensitive adhesive tape may bewound thereon and combined in a manually'operable dispenser to permit stripping from the roll without danger of tearing or employing an inordinate mechanical force to" effect the stripping thereof.

Accordingly-it is an object of my invention to provide in combination with a dispenser for pressure-sensitive adhesive tape, a roll having a spool on which the tape is wound, permitting the employment of pressure sensitive tape having the pressure sensitive adhesive coating continuous or discontinuous, and to permit facile stripping of the same from the roll thereof or without loss;

'lfcattain. these objects. and. such. furtherv objects; as; may: appear-herein or behereinafter the core thereof pointed out, I make reference to the accompanying drawing forming a part hereof in which- Figure l is a plan view of a roll of tape in accordance with my invention;

Figure 2 is a section taken on the line 2--2 of Figure 1;

Figure 3 is a magnified fragmentary section of the core or spool in accordance with my invention;

Figure 4 is a magnified section of a tape in accordance with my invention;

Figure 5 is a perspective view of a tape in accordance with another embodiment of my invention;

Figure 6 is a section taken on the line 6-5 of Figure 5;

Figure 7 is a plan view showing a roll of tape.

with a manually operable dispensing assembly;

Figure 8 is a fragmentary section taken on the line 8-8 of Figure 7;

Figure 9 is a fragmentary section taken on the line 9-9 of Figure '7.

Summarizing my invention, I .provide a core or spool upon which pressure sensitive adhesive tape may be wound and a roll employing such spool in which a generally cylindrical spool is formed, with a belt portion cut away to provide localized areas specifically at the edges, leaving intermediate sections along the length of the tape wound thereon without any pressure strip during the dispensing operation.

Making reference to the drawing, I provide a roll or spool to on which the pressure sensitive adhesive tape H is wound. The spool ID in accordance with my invention comprises a core of cardboard built up by laminations of paper or similar board into a relatively rigid cor-e. accordance with my invention for a roll of tape having a 1" center and a wall l2 built up by laminations of paper to thickness, I form a belt or annular slot l3 of a depth of 1 3' from the periphery M. For a /8" width roll in the length L I provide rims l5 and [6 of approximately each, leaving a clearance portion of between the walls I! and 18, respectively.

With this type of core or spool, winding of pressure sensitive adhesive tape is improved for dispensing purposes, as will appear hereinafter.

The form-of .pressure sensitive adhesive tape contemplated by me may be that shown in Figures 4, 5 and 6. In Figure 4 the simplest form of tape is illustrated comprising a backing l9 and a pressure sensitive adhesive layer 20. The backing may be unified paper-that is, paper which has been treated to unify the fibrils and prevent splitting, and crepe paper unified with a binder is an exemplified form of such material. Other non-splitting types of backing may be employed, such as creped paper having its fibrils unified, or foils of regenerated cellulose, celluloseacetate, metal foil.

The winding of tape upon the spool in accordance with my invention is illustrated in Figures contact or with such contact as will confine the stripping force to a small area, to permit ready stripping and vThe ratchet wheel is 1 and 2 and in magnified form in Figure 3. The plies a, b, c, d, e and 3 shown in Figure 3 when wound upon the spool, in accordance with my invention, result in a tensioned segment 2| and a relaxed segment 22.

By way of oifering an explanation as to the effect produced by winding on a spool in accordance with my invention wherein there is a tensioned portion and a relaxed portion, I point out that the high portions l5 and it bring the adhesive surface of the tape in contact with the back surface of the overlying convolution in pressure contact, requiring a magnitude of considerable force to strip the sheet from adhesive contact, whereas the portions of the spool which are free from pressure contact, such as at the belt slot, serve to bring the plies together in a way to require little, if any, stripping force.

By a relationship of the relaxed surface to the tensioned surface, a varying degree of union of the plies is secured, to minimize the stripping force necessary to dispense the tape, it being understood that the clearance space, such as the belt slot 13, should not be so great as to permit distortion of the tape into the slot during the winding operation, the stripping force along the length of the tape in accordance with my invention being less than the adhesive force across the full width of the tape.

While I prefer to use tape in which the adhesive surface and the backing are co-terminous, I may still further reduce the stripping force to unwind a roll by the employment of a tape shown in Figure 5 wherein a backing [9a has a pressure sensitive adhesive layer 20a covered by its edges with an edging of liner strips 23 and 2s, such as strips of cellophane, to leave an exposed area 25 for pressure sensitive adhesive contact. A roll of tape in accordance with my invention may be employed in a tape dispenser having manual stripping means, illustrated in Figure "1, and to effect some highly desirable effects in the dispensing of the tape especially for more or less one hand manual operation.

For this purpose there is shown in Figure l a dispensing frame 26 comprising a shallow channel metal stamping, with one side plate removed to show the interior. In this construction a trunnion shaft 2'1 supports a. roll 28, to receive the spool l0 previously described, carrying the convoluted pressure sensitive adhesive tape. In the illustration the tape is convoluted so that the adhesive surface 28 is on the inner face and the back surface i9 is on the outer face. In this position the web is guided over the guide pin 29 and the guide roll 30, which rotates on the guide pin 3l. The guide roll 3t is formed with end flanges 32, to limit the adhesive contact to the side edges of the tape. The tape then is directed between the secondary guide roll 33 and the feed roll.34. Rolls 33 and 34 have end flanges 35 and 36, respectively, to grip the tape at the side edges only.

Feed roll 34 is mounted on a shaft 31. This shaft has keyed thereon the ratchet wheel A spring pressed pawl 39 may be employed to limit the rotation of the feed roll 34 in one direction. driven by the rack pivotally mounted on the lever 4! at its end &2, spring 43 being employed to yield and clear the ratchet wheel 38 on the return stroke, as will be understood from the description which follcws.

The lever 4| is pivoted on the shaft M. A hand grip 45 is extended to be accessible through the clearance slot 46 of the frame 26. A coiled spring 41 is mounted on the pin 44 to have one end 2. Aroll of adhesive tape of substantial width, at 48 biased against the pin 49 and the opposite end core of similar width on which said roll is 50 biased against the side of the frame 26. mounted, said core having a belt slot on its outer By the constiuction as described gripping the face to provide contact and depressed surfaces, lever 45 serves to drive the ratchet wheel and, b said roll touching said contact surface and exin turn the feed roll 3 by an angular d splacetending into said slot but out of adhesive conment effect by the hand grip d5 Return movetact with said depressed surface, the width of ment of the spring grip 45 causes the ratchet said contact surface being greater than the width 40 to ride Without movement of the feed roll 34 of said depressed surface.

as previously described. Cutting means, such as 3. A roll of adhesive tape of substantial width, a knife edge, may be provided adjacent the edge a core of similar width on which said roll is against movement during such severing operatending into said slot but out of adhesive contion. tact with said depressed surface, said slot being The assembly which I have provided with the within the body of the core.

roll of tape mounted upon the core as described 4. A roll of adhesive tape of substantial width, a

permits ready feeding and dispensing of prescore of similar width on which said roll is sure sensitive adhesive tape, whether of the plain mounted, said core having a belt slot on its outer the tape from the roll, permitting the employwith said depressed surface, the depth of said merit of backing for the tape of thicknesses here slot being about 3 inch.

tofore deemed unsuitable as too weak for use 5. A roll of adhesive tape of substantial width, in stripping pressure sensitive adhesive tape from a core of similar width on which said roll is a roll. Likewise, a variation in tack of the admounted, said core having a belt slot on its outer hesive will not adversely affect the stripping and race to provide contact and depressed surfaces, dispensing operation from a roll thereby allow- 50 said roll touching said contact surface and exing for greater latitude in use of adhesive of tending into said slot but out of adhesive contact pressure sensitive character. with said depressed surface, said tape having an Furthermore, the minimizing of the active adhhesive surface and an edging strip covering contact of the convolutions of the tape permits that portion of said adhesive surface adjacent of economy in that the last length of the convo- 3 one of the edges of said tape.

lutmn tape may be employed wlthwt Waste" References Cited in the file of this patent UNITED STATES PATENTS hesive tape, including a roll of tape for facilitat- Number Name Date ing the dispensing of this material, and a com- 1,441,543 Tainsh Jan. 9, 1923 bination manually operable dispenser for quickly 1,908,425 Hunt May 9, 1933 furnishing a strip of this packaging material. 1,972,850 McCarthy sept. 4, 1934 Having thus described my invention and illus- 1,981,229 Gillet Nov. 20, 1934 trated its use, what I claim as new and desire 2,140,065 Waechter Dec. 13, 1938 to secure by Letters Patent, is: 2,307,406 Howard Jan. 5, 1943 1. A roll of adhesive tape of substantial Width, 2,395,668 Kellgren Feb. 26, 1946 a core of similar width on which said roll is 2,565,509 Marciu Aug. 28, 1951 mounted, said core having a belt slot on its outer face to provide contact and depressed surfaces, FOREIGN PATENTS said roll touching said contact surface and ex- Number Country Date tending into said slot but out of adhesive contact 324.217 Great Brit n 1 

